參數(shù)資料
型號(hào)： TPS51221RTVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁(yè)數(shù)： 20/39頁(yè)
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
Rgv + 0.1
I
OUT(MAX)
I
OCL(PEAK)
V
OUT
1
Gmv
Vdroop
(11)
Rgv[kW] + 200
I
OUT(MAX)
I
OCL(PEAK)
V
OUT[V]
Vdroop[mV]
(12)
0 +
5
p
I
OCL(PEAK)
1
V
OUT
Gmv
Rgv
Co
t
sw
3
(13)
Co u
15
p
I
OCL(PEAK)
1
V
OUT
Gmv
Rgv
sw
(14)
Cc + Co
ESR
Rgv
(15)
RESISTOR CURRENT SENSING
Cx
Rx +
Lx
Rs
(16)
Co
L
VIN
Rs
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Ex-resistor
Lx(ESL)
www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009
5. Determine Rgv. Rgv should be determined from preferable droop compensation value and is given by the
next equation, based on the typical number of Gmv=500
S.
6. Determine output capacitance Co to achieve stable operation using the next equation. The 0 dB frequency;
o should be kept under 1/3 of the switching frequency.
7. Calculate Cc. Purpose of this capacitance is to cancel zero caused by ESR of the output capacitor. When
using ceramic capacitor(s), there is no need for Cc. If a combination of different capacitors are used,
attaching an RC network circuit might be needed instead of single capacitance to cancel zeros and poles
caused by the output capacitors. In the case of a single capacitance, Cc is given in Equation 15.
8. Choose MOSFETs. Generally, the on resistance strongly affects efficiency at high load conditions as a
conduction loss. In case of low output voltage application, the duty ratio is not so high so that the on
resistance of high-side MOSFET does not greatly affect efficiency. However, switching speed (Tr and Tf)
affects efficiency as a switching loss. As for low-side MOSFET, usually switching loss is not a main portion of
the total loss.
For more accurate current sensing with an external resistor, the following technique is recommended. Adding RC
filtering to cancel the parasitic inductance of the resistor; this filter value can be calculated using Equation 16.
This equation means the time-constant of Cx and Rx should match the one of Lx (ESL) and Rs.
Figure 43. External Resistor Current Sensing
Copyright 2007–2009, Texas Instruments Incorporated
27
Product Folder Link(s): TPS51221
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51221RTVT 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Dual Cntrlr RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51221RTVTG4 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51222 制造商:TI 制造商全稱:Texas Instruments 功能描述:Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
TPS51222RTVR 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51222RTVT 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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